Building Polyfills: Web Platform APIs for the Present and by Brandon Satrom

By Brandon Satrom

upload customized gains to browsers previous and new by way of writing polyfill libraries, JavaScript plugins that take browsers past their local services. during this functional fieldbook, writer Brandon Satrom introduces rules and guidance for polyfill improvement, after which walks you thru the stairs for development a posh, real-world Html5 polyfill.

You’ll additionally discover the way forward for polyfilling—or prollyfilling—that will help you try and paintings with rising thoughts, frequently sooner than browser owners. by the point you end this publication, you’ll have the instruments and hands-on event you must construct trustworthy polyfills for today’s and tomorrow’s Web.

  • Learn the present country of polyfills, together with shims, opt-ins, and drop-ins
  • Use ideas and practices to construct liable polyfills that gain the complete net improvement community
  • Build out numerous gains for an Html5 types polyfill library
  • Configure a construct atmosphere and run automatic cross-browser testing
  • Optimize functionality, deal with facet circumstances, and fine-tune the rate of your polyfill
  • Get examples of prollyfilling libraries that push the limits of the Web
  • Write a pattern prollyfill and evaluate it to present polyfill builds

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Extra resources for Building Polyfills: Web Platform APIs for the Present and Future

Example text

By doing so, I can use Kendo UI’s ready-made options for initializing my library. As a result, I gain an initialization API for my polyfill that’s easy to use and familiar to developers, especially those already familiar with Kendo UI. Initializing an Opt-In Polyfill Kendo UI allows developers to initialize widgets in one of two ways. I can use jQuerystyle widget initialization, as illustrated in Example 3-1, or I can use a declarative-style declaration, which hinges on placing data-role attributes on relevant elements in my markup.

Just as with the color type, Kendo UI Web has a NumericTestBox widget that functions as a nice edit mask control for floating-point values, so we’ll use this widget to polyfill nonsupporting browsers. js, just after my color type code. Example 3-10. kendoNumericTextBox(); } To test this feature, I can load my sample form in a browser that doesn’t support the number type, like IE9 or Firefox, or use the alwaysUseWidgets option. It works like a charm, and you’ll also notice that attributes like min and max, which I specified for the Age field on my sample form in Example 3-4, were preserved by the Kendo UI Numer‐ icTextBox widget.

Example WebIDL snippet for the HTML form element So Web IDL specifies the interface that browsers are to use when building a standard implementation, and browsers do exactly that. What’s more, most of them—perhaps even all of them, but I can’t claim all without seeing Internet Explorer’s code base, which Principles of Responsible Polyfill Development | 17 is not open source—automatically generate Web IDL bindings directly from the specdefined IDL. Chrome even includes Web IDL docs for developers working with the browser source.

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